<template>
    <div class="container">
        <div class="left-board">
            <div class="logo-wrapper">
                <el-button icon="el-icon-back" type="text" @click="back">返回</el-button>
            </div>
            <el-scrollbar class="left-scrollbar">
                <div class="components-list">
                    <div v-for="(item, listIndex) in leftComponents" :key="listIndex">
                        <div class="components-title">
                            <svg-icon icon-class="component"/>
                            {{ item.title }}
                        </div>
                        <draggable
                                class="components-draggable"
                                :list="item.list"
                                :group="{ name: 'componentsGroup', pull: 'clone', put: false }"
                                :clone="cloneComponent"
                                draggable=".components-item"
                                :sort="false"
                                @end="onEnd"
                        >
                            <div
                                    v-for="(element, index) in item.list"
                                    :key="index"
                                    class="components-item"
                                    @click="addComponent(element)"
                            >
                                <div class="components-body">
                                    <svg-icon :icon-class="element.__config__.tagIcon"/>
                                    {{ element.__config__.label }}
                                </div>
                            </div>
                        </draggable>
                    </div>
                </div>
            </el-scrollbar>
        </div>

        <div class="center-board">
            <div class="action-bar">
                <!--        <el-button icon="el-icon-video-play" type="text" @click="run">
                          运行
                        </el-button>
                        <el-button icon="el-icon-view" type="text" @click="showJson">
                          查看json
                        </el-button>
                        <el-button icon="el-icon-download" type="text" @click="download">
                          导出vue文件
                        </el-button>
                        <el-button class="copy-btn-main" icon="el-icon-document-copy" type="text" @click="copy">
                          复制代码
                        </el-button>-->
                <el-button class="el-icon-view" type="text" @click="preview = true">
                    预览
                </el-button>
                <el-button icon="el-icon-s-promotion" type="text" @click="submit">
                    提交
                </el-button>
                <el-button class="delete-btn" icon="el-icon-delete" type="text" @click="empty">
                    清空
                </el-button>
            </div>
            <el-scrollbar class="center-scrollbar">
                <el-row class="center-board-row" :gutter="formConf.gutter">
                    <el-form
                            :size="formConf.size"
                            :label-position="formConf.labelPosition"
                            :disabled="formConf.disabled"
                            :label-width="formConf.labelWidth + 'px'"
                    >
                        <draggable class="drawing-board" :list="drawingList" :animation="340" group="componentsGroup">
                            <draggable-item
                                    v-for="(item, index) in drawingList"
                                    :key="item.renderKey"
                                    :drawing-list="drawingList"
                                    :current-item="item"
                                    :index="index"
                                    :active-id="activeId"
                                    :form-conf="formConf"
                                    @activeItem="activeFormItem"
                                    @copyItem="drawingItemCopy"
                                    @deleteItem="drawingItemDelete"
                            />
                        </draggable>
                        <div v-show="!drawingList.length" class="empty-info">
                            从左侧拖入或点选组件进行表单设计
                        </div>
                    </el-form>
                </el-row>
            </el-scrollbar>
        </div>

        <right-panel
                :active-data="activeData"
                :form-conf="formConf"
                :show-field="!!drawingList.length"
                @tag-change="tagChange"
                @fetch-data="fetchData"
        />

        <form-drawer
                :visible.sync="drawerVisible"
                :form-data="formData"
                size="100%"
                :generate-conf="generateConf"
        />
        <json-drawer
                size="60%"
                :visible.sync="jsonDrawerVisible"
                :json-str="JSON.stringify(formData)"
                @refresh="refreshJson"
        />
        <code-type-dialog
                :visible.sync="dialogVisible"
                title="选择生成类型"
                :show-file-name="showFileName"
                @confirm="generate"
        />
        <input id="copyNode" type="hidden">

        <el-drawer
                title="标题"
                :visible.sync="preview"
                direction="ltr"
                :size="parseInt(previewWidth) + 100 + 'px'"
                :with-header="false">
           <div style="padding: 30px">
               <el-select v-model="screenSize" placeholder="屏幕大小" size="small" @change="screenSizeChange">
                   <el-option v-for="item in screenSizeList" :key="item.value" :label="item.label"
                              :value="item.value">
                   </el-option>
               </el-select>
               <el-input :disabled="screenSize == 'custom' ? false : true" size="small" v-model="previewWidth" placeholder="屏幕宽度" style="width: 100px"></el-input>
               <el-input :disabled="screenSize == 'custom' ? false : true" size="small" v-model="previewHeight" placeholder="屏幕高度" style="width: 100px"></el-input>
               <div class="interspaceH"></div>
               <div style="width: 100%;display: flex;justify-content: center">
                   <!-- :src="'http://wx.tpchain.net/pages/form/form?id=' + previewId" -->
                   <iframe :src="'http://wx.tpchain.net/pages/form/form'" :style="{'border': '1px solid #e7e7e7 ','width': previewWidth + 'px','height': previewHeight + 'px'}"></iframe>
               </div>
           </div>
        </el-drawer>
    </div>
</template>

<script>
import draggable from 'vuedraggable'
import {debounce} from 'throttle-debounce'
import {saveAs} from 'file-saver'
import ClipboardJS from 'clipboard'
import render from '@/components/render/render'
import FormDrawer from './FormDrawer'
import JsonDrawer from './JsonDrawer'
import RightPanel from './RightPanel'
import {
    inputComponents, selectComponents, layoutComponents, formConf
} from '@/components/generator/config'
import {
    exportDefault, beautifierConf, isNumberStr, titleCase, deepClone, isObjectObject
} from '@/util/index'
import {
    makeUpHtml, vueTemplate, vueScript, cssStyle
} from '@/components/generator/html'
import {makeUpJs} from '@/components/generator/js'
import {makeUpCss} from '@/components/generator/css'
import drawingDefalut from '@/components/generator/drawingDefalut'
import logo from '@/assets/logo.png'
import CodeTypeDialog from './CodeTypeDialog'
import DraggableItem from './DraggableItem'
import {
    getDrawingList, saveDrawingList, getIdGlobal, saveIdGlobal, getFormConf
} from '@/util/db'
import loadBeautifier from '@/util/loadBeautifier'

let beautifier
const emptyActiveData = {style: {}, autosize: {}}
let oldActiveId
let tempActiveData
const drawingListInDB = getDrawingList()
const formConfInDB = getFormConf()
const idGlobal = getIdGlobal()
const screenSizeList = [
    {
        label: 'Moto G4',
        value: '360*640'
    },
    {
        label: 'Pixel',
        value: '411*731'
    },
    {
        label: 'iphone 5/SE',
        value: '320*568'
    },
    {
        label: 'iphone 6/7/8',
        value: '375*667'
    },
    {
        label: 'iphone 6/7/8 Plus',
        value: '375*736'
    },
    {
        label: 'iphone X',
        value: '375*812'
    },
    {
        label: 'iPad',
        value: '768*1024'
    },
    {
        label: 'iPad Pro',
        value: '1024*1366'
    },
    {
        label: 'Galaxy Fold',
        value: '280*653'
    },
    {
        label: '自定义',
        value: 'custom'
    }
]

export default {
    components: {
        draggable,
        render,
        FormDrawer,
        JsonDrawer,
        RightPanel,
        CodeTypeDialog,
        DraggableItem
    },
    props: {
        drawingList: {
            type: Array,
            default: () => drawingDefalut
        },
        activeId: {
            type: String,
            default: () => drawingDefalut[0].formId
        },
        drawingDefalut: {
            type: Array,
            default: () => drawingDefalut
        },
        activeData: {
            type: Object,
            default: () => drawingDefalut[0]
        },
        backParams: {
            type: String,
            default: () => ""
        }
    },
    data() {
        return {
            logo,
            idGlobal,
            formConf,
            inputComponents,
            selectComponents,
            layoutComponents,
            labelWidth: 100,
            // drawingList: drawingDefalut,
            // drawingDefalut: drawingDefalut,
            drawingData: {},
            // activeId: drawingDefalut[0].formId,
            drawerVisible: false,
            formData: {},
            dialogVisible: false,
            jsonDrawerVisible: false,
            generateConf: null,
            showFileName: false,
            // activeData: drawingDefalut[0],
            saveDrawingListDebounce: debounce(340, saveDrawingList),
            saveIdGlobalDebounce: debounce(340, saveIdGlobal),
            leftComponents: [
                {
                    title: '输入型组件',
                    list: inputComponents
                },
                {
                    title: '选择型组件',
                    list: selectComponents
                },
                {
                    title: '其他组件',
                    list: layoutComponents
                }
            ],
            preview: false,
            previewId: '',
            previewWidth: '375',
            previewHeight: '812',
            screenSize: 'custom',
            screenSizeList: [...screenSizeList]
        }
    },
    computed: {},
    watch: {
        // eslint-disable-next-line func-names
        'activeData.__config__.label': function (val, oldVal) {
            if (
                this.activeData.placeholder === undefined
                || !this.activeData.__config__.tag
                || oldActiveId !== this.activeId
            ) {
                return
            }
            this.activeData.placeholder = this.activeData.placeholder.replace(oldVal, '') + val
        },
        activeId: {
            handler(val) {
                oldActiveId = val
            },
            immediate: true
        },
        drawingList: {
            handler(val) {
                this.saveDrawingListDebounce(val)
                if (val.length === 0) this.idGlobal = 100
            },
            deep: true
        },
        idGlobal: {
            handler(val) {
                this.saveIdGlobalDebounce(val)
            },
            immediate: true
        }
    },
    mounted() {
        if (Array.isArray(drawingListInDB) && drawingListInDB.length > 0) {
            this.drawingList = drawingListInDB
        } else {
            this.drawingList = drawingDefalut
        }
        this.activeFormItem(this.drawingList[0])
        if (formConfInDB) {
            this.formConf = formConfInDB
        }
        loadBeautifier(btf => {
            beautifier = btf
        })
        const clipboard = new ClipboardJS('#copyNode', {
            text: trigger => {
                const codeStr = this.generateCode()
                this.$notify({
                    title: '成功',
                    message: '代码已复制到剪切板，可粘贴。',
                    type: 'success'
                })
                return codeStr
            }
        })
        clipboard.on('error', e => {
            this.$message.error('代码复制失败')
        })
    },
    methods: {
        screenSizeChange(e) {
            if (e != 'custom') {
                let arr = e.split('*')
                this['previewWidth'] = arr[0]
                this['previewHeight'] = arr[1]
            }
        },
        setObjectValueReduce(obj, strKeys, data) {
            const arr = strKeys.split('.')
            arr.reduce((pre, item, i) => {
                if (arr.length === i + 1) {
                    pre[item] = data
                } else if (!isObjectObject(pre[item])) {
                    pre[item] = {}
                }
                return pre[item]
            }, obj)
        },
        setRespData(component, resp) {
            const {dataPath, renderKey, dataConsumer} = component.__config__
            if (!dataPath || !dataConsumer) return
            const respData = dataPath.split('.').reduce((pre, item) => pre[item], resp)

            // 将请求回来的数据，赋值到指定属性。
            // 以el-tabel为例，根据Element文档，应该将数据赋值给el-tabel的data属性，所以dataConsumer的值应为'data';
            // 此时赋值代码可写成 component[dataConsumer] = respData；
            // 但为支持更深层级的赋值（如：dataConsumer的值为'options.data'）,使用setObjectValueReduce
            this.setObjectValueReduce(component, dataConsumer, respData)
            const i = this.drawingList.findIndex(item => item.__config__.renderKey === renderKey)
            if (i > -1) this.$set(this.drawingList, i, component)
        },
        fetchData(component) {
            const {dataType, method, url} = component.__config__
            if (dataType === 'dynamic' && method && url) {
                this.setLoading(component, true)
                this.$axios({
                    method,
                    url
                }).then(resp => {
                    this.setLoading(component, false)
                    this.setRespData(component, resp.data)
                })
            }
        },
        setLoading(component, val) {
            const {directives} = component
            if (Array.isArray(directives)) {
                const t = directives.find(d => d.name === 'loading')
                if (t) t.value = val
            }
        },
        activeFormItem(currentItem) {
            this.activeData = currentItem
            this.activeId = currentItem.__config__.formId
        },
        onEnd(obj) {
            if (obj.from !== obj.to) {
                this.fetchData(tempActiveData)
                this.activeData = tempActiveData
                this.activeId = this.idGlobal
            }
        },
        addComponent(item) {
            const clone = this.cloneComponent(item)
            this.fetchData(clone)
            this.drawingList.push(clone)
            this.activeFormItem(clone)
        },
        cloneComponent(origin) {
            const clone = deepClone(origin)
            const config = clone.__config__
            config.span = this.formConf.span // 生成代码时，会根据span做精简判断
            this.createIdAndKey(clone)
            clone.placeholder !== undefined && (clone.placeholder += config.label)
            tempActiveData = clone
            return tempActiveData
        },
        createIdAndKey(item) {
            const config = item.__config__
            config.formId = ++this.idGlobal
            config.renderKey = `${config.formId}${+new Date()}` // 改变renderKey后可以实现强制更新组件
            if (config.layout === 'colFormItem') {
                item.__vModel__ = `field${this.idGlobal}`
            } else if (config.layout === 'rowFormItem') {
                config.componentName = `row${this.idGlobal}`
                !Array.isArray(config.children) && (config.children = [])
                delete config.label // rowFormItem无需配置label属性
            }
            if (Array.isArray(config.children)) {
                config.children = config.children.map(childItem => this.createIdAndKey(childItem))
            }
            return item
        },
        AssembleFormData() {
            this.formData = {
                fields: deepClone(this.drawingList),
                ...this.formConf
            }
        },
        generate(data) {
            const func = this[`exec${titleCase(this.operationType)}`]
            this.generateConf = data
            func && func(data)
        },
        execRun(data) {
            this.AssembleFormData()
            this.drawerVisible = true
        },
        execDownload(data) {
            const codeStr = this.generateCode()
            const blob = new Blob([codeStr], {type: 'text/plain;charset=utf-8'})
            saveAs(blob, data.fileName)
        },
        execCopy(data) {
            document.getElementById('copyNode').click()
        },
        empty() {
            let that = this
            this.$confirm('确定要清空所有组件吗？', '提示', {type: 'warning'}).then(
                () => {
                    that.drawingList = []
                    that.idGlobal = 100
                }
            )
        },
        drawingItemCopy(item, list) {
            let clone = deepClone(item)
            clone = this.createIdAndKey(clone)
            list.push(clone)
            this.activeFormItem(clone)
        },
        drawingItemDelete(index, list) {
            list.splice(index, 1)
            this.$nextTick(() => {
                const len = this.drawingList.length
                if (len) {
                    this.activeFormItem(this.drawingList[len - 1])
                }
            })
        },
        generateCode() {
            const {type} = this.generateConf
            this.AssembleFormData()
            const script = vueScript(makeUpJs(this.formData, type))
            const html = vueTemplate(makeUpHtml(this.formData, type))
            const css = cssStyle(makeUpCss(this.formData))
            return beautifier.html(html + script + css, beautifierConf.html)
        },
        showJson() {
            this.AssembleFormData()
            this.jsonDrawerVisible = true
        },
        back() {
            this.$emit('back', this.backParams)
        },
        submit() {
            this.AssembleFormData()
            this.$emit('submit', this.formData, this.backParams)
        },
        download() {
            this.dialogVisible = true
            this.showFileName = true
            this.operationType = 'download'
        },
        run() {
            this.dialogVisible = true
            this.showFileName = false
            this.operationType = 'run'
        },
        copy() {
            this.dialogVisible = true
            this.showFileName = false
            this.operationType = 'copy'
        },
        tagChange(newTag) {
            newTag = this.cloneComponent(newTag)
            const config = newTag.__config__
            newTag.__vModel__ = this.activeData.__vModel__
            config.formId = this.activeId
            config.span = this.activeData.__config__.span
            this.activeData.__config__.tag = config.tag
            this.activeData.__config__.tagIcon = config.tagIcon
            this.activeData.__config__.document = config.document
            if (typeof this.activeData.__config__.defaultValue === typeof config.defaultValue) {
                config.defaultValue = this.activeData.__config__.defaultValue
            }
            Object.keys(newTag).forEach(key => {
                if (this.activeData[key] !== undefined) {
                    newTag[key] = this.activeData[key]
                }
            })
            this.activeData = newTag
            this.updateDrawingList(newTag, this.drawingList)
        },
        updateDrawingList(newTag, list) {
            const index = list.findIndex(item => item.__config__.formId === this.activeId)
            if (index > -1) {
                list.splice(index, 1, newTag)
            } else {
                list.forEach(item => {
                    if (Array.isArray(item.__config__.children)) this.updateDrawingList(newTag, item.__config__.children)
                })
            }
        },
        refreshJson(data) {
            this.drawingList = deepClone(data.fields)
            delete data.fields
            this.formConf = data
        }
    }
}
</script>

<style lang='scss'>
@import '../../styles/home';
</style>
